SOLUTION: Hi, I am hoping you could solve this equation with a step by step picture on how you got what you did at each step. I have an exam and I am really struggling. Thanks Numerator:

Algebra ->  Radicals -> SOLUTION: Hi, I am hoping you could solve this equation with a step by step picture on how you got what you did at each step. I have an exam and I am really struggling. Thanks Numerator:       Log On


   



Question 1110967: Hi, I am hoping you could solve this equation with a step by step picture on how you got what you did at each step. I have an exam and I am really struggling. Thanks
Numerator: 3+3^(1/3)
Denominator: 9^(1/3)
It is actually the cubed root of 3 and the cubed root of 9, I just didnt know how to type that

Found 2 solutions by Alan3354, math_helper:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Numerator: 3+3^(1/3)
Denominator: 9^(1/3)
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It's not an equation. There's no equal sign.
It's a fraction than can be simplified some.
It's "cube root" not cubed root.
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3%2B3%5E%281%2F3%29%2F%289%5E%281%2F3%29%29
The rendering on this site makes it hard to read.
= 3%2B3%5E%281%2F3%29%2F%283%5E%282%2F3%29%29
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Multiply NUM and DEN by 3^(1/3)
= %283%2Aroot%283%2C3%29+%2B+3%5E%282%2F3%29%29%2F3%29
---
= root%283%2C3%29+%2B+root%283%2C9%29%2F3%29


Answer by math_helper(2461) About Me  (Show Source):
You can put this solution on YOUR website!
I think this is what you want: (you can use 'show source' to see how to format):
+%283%2B+root%283%2C3%29%29+%2F+%28root%283%2C9%29%29+
This is not an equation, it is an expression. The question must be to rationalize the expression (get rid of as many roots as possible, in particular, from the denominator):

++%283%2Broot%283%2C3%29%29+%2F+%28root%283%2C9%29%29++
Multiply top and bottom by root%283%2C9%5E2%29+=+9%5E%282%2F3%29+
=
Simplify denominator:
= +%28%283%2Broot%283%2C3%29%29+%2A+%28root%283%2C81%29+%29%29+%2F+9++
Notice that +root%283%2C81%29+=+root%283%2C3%5E4%29+
Multiply out the numerator, using the above equivalence:
= +%28root%283%2C3%5E7%29+%2Broot%283%2C3%5E5%29%29++%2F+9++
Factor out a 3 from the numerator and cancel it with one of the 3's in the denominator
9=3*3 so now the denominator is just 3: ( 3*Numerator / 9 = Numerator / 3 )
= +3%28root%283%2C3%5E4%29+%2Broot%283%2C3%5E2%29%29++%2F+9++

= +%28root%283%2C3%5E4%29+%2Broot%283%2C3%5E2%29%29++%2F+3++

Expand the contents of the radical signs
= +highlight%28+%28root%283%2C81%29+%2Broot%283%2C9%29%29++%2F+3+%29+
In many cases, this is considered rationalized, and it can be left in this form.

The only additional step I see that might be needed by your teacher would be to
break (A+B)/3 into A/3 + B/3 because it lowers the exponents under the radical sign:
Starting with
= +%28root%283%2C3%5E4%29%2F3%29+%2Broot%283%2C3%5E2%29%2F3++
= ++root%283%2C3%29+%2B++root%283%2C9%29%2F3+